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1. Using a Texutre Atlas (Sampling Specific Texture Coordinates)

   

   Topic by jocose · Sep 2010 · Home› Unreal Engine

   I have an alpha sheet that has several decal textures in it. Rather than making an entirely new texture I was wondering if there was some way of sampling a sub section of it and then using that as a material for a particle. It seams like there should be some way to do this but I can't figure anything out. If anyone has any…

2. Re: Using a Texutre Atlas (Sampling Specific Texture Coordinates)

   

   Reply by jocose · Sep 2010 · Home› Unreal Engine

   THANKS DIVI, I got it working here is the result: Now i'm left wondering how good of an idea this is in the first place. Pros: Less textures need to be loaded into memory Cons: * More complex shader is needed to sample a sub section of a larger texture. * This texture can't be re-used for other parts of the mission without…

3. Re: Using a Texutre Atlas (Sampling Specific Texture Coordinates)

   

   Reply by jocose · Sep 2010 · Home› Unreal Engine

   Thanks for the reply :) I don't think so because it looks like that system requires you to have an evenly divided texture. The texture i'm using is just a sheet of random images from all over the level. I wanted to pack a few particles in there to fill space since I already had an alpha chan. Dividing up the texture evenly…

4. Re: Using a Texutre Atlas (Sampling Specific Texture Coordinates)

   

   Reply by divi · Sep 2010 · Home› Unreal Engine

   http://udn.epicgames.com/Three/TerrainAdvancedTextures.html#Texture%20Packing:%20Implementing%20large%20texture%20tile%20sets that should do

5. Re: Using a Texutre Atlas (Sampling Specific Texture Coordinates)

   

   Reply by mbullister · Sep 2010 · Home› Unreal Engine

   Would this do what you want? http://udn.epicgames.com/Three/ParticleSpriteSubUVEmitterTutorial.html

6. Re: Using a Texutre Atlas (Sampling Specific Texture Coordinates)

   

   Reply by jocose · Sep 2010 · Home› Unreal Engine

   I don't think that is really a viable solution since this is going to be used as particle not a decal :(

7. Re: Using a Texutre Atlas (Sampling Specific Texture Coordinates)

   

   Reply by divi · Sep 2010 · Home› Unreal Engine

   maybe use the whole decal sheet on one material without extracting a part of it and just offset and scale it via the placement widgets to get just the part of the sheet to show up that you want at that position. http://udn.epicgames.com/Three/UsingDecals.html